New 🐟 Mercury Safety Guide & Omega-3 Rankings Updated for 2026. View Omega-3 Rankings →

💧 Freshwater Least Concern 🍽️ Edible 🌡️ Tropical

Threadfin rainbowfish

Iriatherina werneri Meinken, 1974
Max Length
4 cm
Max Weight
Lifespan
Trophic Level
2.8
Depth
Climate
Tropical
Resilience
High
Vulnerability
22.00/100
Typical Length
3 cm
Depth Zone
demersal

📖 Overview

Inhabits lowland swamps, drainage ditches and streams that have abundant vegetation . Occurs in slow-flowing streams, swampy ponds and billabongs with abundant aquatic vegetation. Temperature and pH ranges are 23°-28°C and 5.2-6.6, respectively . Most commonly found along the heavily vegetated margins of lily lagoons and small streams. Feeds mostly on diatoms and micro-crustaceans. Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 60 cm . Well established in the aquarium hobby, but its longetivity is relatively brief, averaging only 2-3 years .

Scientific Name
Iriatherina werneri
Authority
Meinken, 1974
Habitat
Freshwater
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
4 cm
Trophic Level
2.8
Resilience
High
Vulnerability
22.00/100
Water Temp
26–30 °C
Salinity
0–0.5 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 7 - 10; Dorsal soft rays (total): 7; Anal spines: 1; Anal soft rays: 10 - 12. : fusiform / normal.

🌀 Behaviour

Behavioural data for Threadfin rainbowfish is currently being reviewed.

🦐 Diet

Diet information for Threadfin rainbowfish is currently being compiled.

🥚 Reproduction

Reproduction data for Threadfin rainbowfish is currently being compiled.

🌍 Habitat & Distribution

Freshwater; demersal; pH range: 6.0 - 8.0; dH range: 5 - 12. Tropical; 26°C - 30°C ; 5°S - 10°S

🌿 Ecology

Zone Preferences
💧 Freshwater ⬇️ Benthic
Trophic Level
2.8±0.34

📐 Morphometrics

Length–Weight Relationship: W = 0.01122 × L3.04 (TL)
Max TL
4cm
Dorsal Spines
9
Dorsal Rays
7
Anal Spines
1
Anal Rays
11

🌡️ Water Parameters & Tolerance

Temperature Range
26–30°C
pH Range
6–8
Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
22.00/100
Low vulnerability
Trophic Level
2.8
Omnivore / Planktivore
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Meinken, 1974

🍽️ Edibility & Flavour

"Threadfin rainbowfish is an edible species."

✗ Not for Raw
✓ Fresh Indicators
  • Clear, bright eyes — cloudy eyes indicate age
  • Firm flesh that springs back when pressed
  • Fresh ocean smell, never strong or ammonia-like
  • Bright red or pink gills, not grey or brown
  • Shiny, moist skin with scales tightly attached
✗ Avoid If
  • Cloudy or sunken eyes
  • Strong fishy or ammonia odour
  • Soft, mushy flesh that doesn't spring back
  • Discoloured or dry flesh
Best Cooking Methods
Baking Grilling Pan-frying

Nutrition

Detailed nutritional data for Threadfin rainbowfish is currently being compiled from USDA FoodData Central.

🔬 Mercury Safety

Mercury data for Threadfin rainbowfish has not yet been assigned. Please consult FDA/EPA guidance for general seafood safety advice.

🌿 Sustainability

Best Choice
Healthy stocks, low impact
Good Alternative
Well-managed, minor concerns
Use Caution
Check sourcing and season
Avoid
Overfished or high impact

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) — 2 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
0 Observations logged on Aquareap

No observations yet — be the first to log one!

View all observations for Threadfin rainbowfish ↗
Suggest an Edit

Spotted incorrect or outdated data? Submit a correction and our editorial team will review it. Approved edits go live within 48 hours.

Link to a scientific paper, FishBase, or other authoritative source
Report an Issue

Found a factual error, broken data, or inappropriate content? Let us know and we will investigate promptly.